Contact charging of silica glass particles in a single collision

Hu, Wenwen; Xie, Linghai; Zheng, Xiaojing

doi:10.1063/1.4752458

Cited by 40 publications

(49 citation statements)

References 40 publications

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“…Lacks and coworkers later showed how the same geometrical asymmetry also arises with random collisions among particles of different size [16][17][18]. However, while in most situations the transferred charge species is negative, there are some materials, such as nylon, where the polarity is reversed, which points to the possibility that other charge species might be responsible (Hu et al recently suggested trapped holes might explain the polarity reversal [19]). …”

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confidence: 99%

Size-Dependent Same-Material Tribocharging in Insulating Grains

et al. 2014

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Observations of flowing granular matter have suggested that same-material tribocharging depends on particle size, typically rendering large grains positive and small ones negative. Models assuming the transfer of trapped electrons can account for this trend, but have not been validated. Tracking individual grains in an electric field, we show quantitatively that charge is transferred based on size between materially identical grains. However, the surface density of trapped electrons, measured independently by thermoluminescence techniques, is orders of magnitude too small to account for the scale of charge transferred. This reveals that trapped electrons are not a necessary ingredient for same-material tribocharging.

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confidence: 99%

Size-Dependent Same-Material Tribocharging in Insulating Grains

et al. 2014

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“…Remarkably, however, grains that are absolutely identical in shape, size and chemical composition have also been found to charge one another [16,[18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Field driven charging dynamics of a fluidized granular bed

et al. 2016

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A simplified model has previously described the inductive charging of colliding identical grains in the presence of an external electric field. Here we extend that model by including heterogeneous surface charge distributions, grain rotations and electrostatic interactions between grains. We find from this more realistic model that strong heterogeneities in charging can occur in agitated granular beds, and we predict that shielding due to these heterogeneities can dramatically alter the charging rate in such beds.

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“…Moreover, the charge carriers among them could be electrons Lacks, 2009), ions (McCarty andWhitesides, 2008), trapped holes (Hu et al, 2012), and bits of nanoscopic material (Apodaca et al, 2010), depending on the material properties and condition involved (Lacks and Sankaran, 2011;Wei and Gu, 2015). These models mainly focus on explaining 365 size-dependent charging (that is, smaller particles tend to acquire a net negative charge during collisions with larger particles) of dust particles without considering the environmental factors, which have been found to considerably affect dust electrification.…”

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confidence: 99%

“…To quantitatively predict the charge transfer processes between dust particle collisions/contacts, a large number of theoretical models have been developed based on different physical mechanisms, such as asymmetric contact (Hu et al, 2012;Kok and Lacks, 2009;Kok and Renno, 2008), polarization by external E-fields (Pähtz et al, 2012), statistical variations of material 360…”

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confidence: 99%

Quantifying the large-scale electrification equilibrium effects in dust storms using field observations at Qingtu Lake Observatory

Zhang¹,

Zheng²

2018

Preprint

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Dust/sand electrification, which is a ubiquitous phenomenon in dust events, has a potentially dramatic effect on dust/sand lifting and transport processes. However, the 15 effect of such electrification is still largely unclear, mainly due to its complexity and sparse observations. Here, we conducted an extensive observational analysis involving mild and severe dust storms with minimum visibility, ranging from ~0.09 to 0.93 km, to assess the electrical properties of airborne dust particles in dust storms. The space charge density has been estimated indirectly based on Gauss's law. Using the wavelet coherence analysis 20 that is a method for evaluating the correlations between two non-stationary time series in the time-frequency domain, we found that the space charge density and dust concentration were significantly correlated over the 10 min timescales that is on the order of the typical integral time scale of atmospheric turbulence. We further presented a simple linear regression (SLR) model to quantify such large timescale correlations and 25 found that there was a significant linear relationship between space charge density and dust concentration at given ambient temperature and relative humidity (RH), suggesting that the estimated mean charge-to-mass ratio of dust particles was expected to remain constant (termed as the equilibrium value * ). nn addition, the influences of ambient temperature and RH on * were evaluated by a multiple linear regression (MLR) model,

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Contact charging of silica glass particles in a single collision

Cited by 40 publications

References 40 publications

Size-Dependent Same-Material Tribocharging in Insulating Grains

Size-Dependent Same-Material Tribocharging in Insulating Grains

Field driven charging dynamics of a fluidized granular bed

Quantifying the large-scale electrification equilibrium effects in dust storms using field observations at Qingtu Lake Observatory

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